Guhring cobalt micro drills are manufactured with high precision and tight tolerances for demanding small diameter drilling applications down to 0.05 mm (0.002 in). Available in both right and left hand helix styles, these micro drills have an oversize common shank of either 1.0, 1.5, or 2.0 mm depending on the diameter of the drill. This provides added rigidity and increased surface area for fixturing the drill.